From the product description, check product page for current description, price and availability:

• PROFESSIONAL HEAT MAT – Provide your seedlings with a warmer environment to speed up germination, raise success rates, and increase growth rates; A faster growth rate translates to quicker transplant times and higher future yields; Use indoors, in greenhouses, and grow tents, help make your garden a healthy and fruitful place
• DURABLE & RELIABLE – Made with heavy duty PVC material that is durable and resists wear and tear; Complies with MET standards; multi-layer structure with built-in insulated wiring and PET film design follows strict safety standards; IPX-4 water-resistant surface helps keep the device clean and functioning properly
• STABLE HEATING SYSTEM – Automatically warms root area 10-20℉(5-11℃) over the ambient air temperature, which will increase the success of seedlings and cuttings; We recommend using this with VIVOHOME thermostat for proper temperature control
• EASY TO USE – Simply flatten and place beneath your seedling tray and plug the cord into a standard 120V outlet to begin heating; With helpful instructions and growing tips printed on the mat, you’ll never be at a loss for growing your plants
• STORE AWAY – Dimensions: 10 x 20.75 inches, with a 5.7-ft power cord, this heating pad fits standard 1020 seedling trays; Comes with a handy carrying bag; Seeds germinated and you need to store the mat? Simply roll it up and pack it away, guaranteed not to take up much room